21/32 Quadrajet Varajet R1 - This is FLUORELASTOMER a special purpose fluorocarbon-based synthetic rubber. It has wide chemical resistance and superior performance, especially in high temperature . These are only resistant to a point

HOW TO BUILD & MODIFY ROCHESTER QUADRAJET CARBURETORS- The book is a complete guide to selecting, rebuilding, and modifying the Q- Jet, aimed at both muscle car restorers and racers. It includes a history of the Q-Jet, an explanation of how the carb works, a guide to selecting and finding the right carb, instructions on how to rebuild the carb, and extensive descriptions of high-performance modifications that will help anyone with a Q-Jet car crush the competition.